NVD / CVE Program· CNA Linux

CVE-2022-50408: wifi: brcmfmac: fix use-after-free bug in brcmf_netdev_start_xmit()

Noroxi assessment

Priority: Monitor (action score 31/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.16% (FIRST EPSS).
Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Linux Linux 1613a7b24f1a7467cb727ba3ec77c9a808383560, 232d59eca07f6ea27307022a33d226aff373bd02, 27574a3f421c3a1694d0207f37c6bbf23d66978e.

Low priority for now. Upgrade to Linux Linux 1613a7b24f1a7467cb727ba3ec77c9a808383560, 232d59eca07f6ea27307022a33d226aff373bd02, 27574a3f421c3a1694d0207f37c6bbf23d66978e or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: fix use-after-free bug in brcmf_netdev_start_xmit() > ret = brcmf_proto_tx_queue_data(drvr, ifp->ifidx, skb); may be schedule, and then complete before the line > ndev->stats.tx_bytes += skb->len; [ 46.912801] ================================================================== [ 46.920552] BUG: KASAN: use-after-free in brcmf_netdev_start_xmit+0x718/0x8c8 [brcmfmac] [ 46.928673] Read of size 4 at addr ffffff803f5882e8 by task systemd-resolve/328 [ 46.935991] [ 46.937514] CPU: 1 PID: 328 Comm: systemd-resolve Tainted: G O 5.4.199-[REDACTED] #1 [ 46.947255] Hardware name: [REDACTED] [ 46.954568] Call trace: [ 46.957037] dump_backtrace+0x0/0x2b8 [ 46.960719] show_stack+0x24/0x30 [ 46.964052] dump_stack+0x128/0x194 [ 46.967557] print_address_description.isra.0+0x64/0x380 [ 46.972877] __kasan_report+0x1d4/0x240 [ 46.976723] kasan_report+0xc/0x18 [ 46.980138] __asan_report_load4_noabort+0x18/0x20 [ 46.985027] brcmf_netdev_start_xmit+0x718/0x8c8 [brcmfmac] [ 46.990613] dev_hard_start_xmit+0x1bc/0xda0 [ 46.994894] sch_direct_xmit+0x198/0xd08 [ 46.998827] __qdisc_run+0x37c/0x1dc0 [ 47.002500] __dev_queue_xmit+0x1528/0x21f8 [ 47.006692] dev_queue_xmit+0x24/0x30 [ 47.010366] neigh_resolve_output+0x37c/0x678 [ 47.014734] ip_finish_output2+0x598/0x2458 [ 47.018927] __ip_finish_output+0x300/0x730 [ 47.023118] ip_output+0x2e0/0x430 [ 47.026530] ip_local_out+0x90/0x140 [ 47.030117] igmpv3_sendpack+0x14c/0x228 [ 47.034049] igmpv3_send_cr+0x384/0x6b8 [ 47.037895] igmp_ifc_timer_expire+0x4c/0x118 [ 47.042262] call_timer_fn+0x1cc/0xbe8 [ 47.046021] __run_timers+0x4d8/0xb28 [ 47.049693] run_timer_softirq+0x24/0x40 [ 47.053626] __do_softirq+0x2c0/0x117c [ 47.057387] irq_exit+0x2dc/0x388 [ 47.060715] __handle_domain_irq+0xb4/0x158 [ 47.064908] gic_handle_irq+0x58/0xb0 [ 47.068581] el0_irq_naked+0x50/0x5c [ 47.072162] [ 47.073665] Allocated by task 328: [ 47.077083] save_stack+0x24/0xb0 [ 47.080410] __kasan_kmalloc.isra.0+0xc0/0xe0 [ 47.084776] kasan_slab_alloc+0x14/0x20 [ 47.088622] kmem_cache_alloc+0x15c/0x468 [ 47.092643] __alloc_skb+0xa4/0x498 [ 47.096142] igmpv3_newpack+0x158/0xd78 [ 47.099987] add_grhead+0x210/0x288 [ 47.103485] add_grec+0x6b0/0xb70 [ 47.106811] igmpv3_send_cr+0x2e0/0x6b8 [ 47.110657] igmp_ifc_timer_expire+0x4c/0x118 [ 47.115027] call_timer_fn+0x1cc/0xbe8 [ 47.118785] __run_timers+0x4d8/0xb28 [ 47.122457] run_timer_softirq+0x24/0x40 [ 47.126389] __do_softirq+0x2c0/0x117c [ 47.130142] [ 47.131643] Freed by task 180: [ 47.134712] save_stack+0x24/0xb0 [ 47.138041] __kasan_slab_free+0x108/0x180 [ 47.142146] kasan_slab_free+0x10/0x18 [ 47.145904] slab_free_freelist_hook+0xa4/0x1b0 [ 47.150444] kmem_cache_free+0x8c/0x528 [ 47.154292] kfree_skbmem+0x94/0x108 [ 47.157880] consume_skb+0x10c/0x5a8 [ 47.161466] __dev_kfree_skb_any+0x88/0xa0 [ 47.165598] brcmu_pkt_buf_free_skb+0x44/0x68 [brcmutil] [ 47.171023] brcmf_txfinalize+0xec/0x190 [brcmfmac] [ 47.176016] brcmf_proto_bcdc_txcomplete+0x1c0/0x210 [brcmfmac] [ 47.182056] brcmf_sdio_sendfromq+0x8dc/0x1e80 [brcmfmac] [ 47.187568] brcmf_sdio_dpc+0xb48/0x2108 [brcmfmac] [ 47.192529] brcmf_sdio_dataworker+0xc8/0x238 [brcmfmac] [ 47.197859] process_one_work+0x7fc/0x1a80 [ 47.201965] worker_thread+0x31c/0xc40 [ 47.205726] kthread+0x2d8/0x370 [ 47.208967] ret_from_fork+0x10/0x18 [ 47.212546] [ 47.214051] The buggy address belongs to the object at ffffff803f588280 [ 47.214051] which belongs to the cache skbuff_head_cache of size 208 [ 47.227086] The buggy address is located 104 bytes inside of [ 47.227086] 208-byte region [ffffff803f588280, ffffff803f588350) [ 47.238814] The buggy address belongs to the page: [ 47.243618] page:ffffffff00dd6200 refcount:1 mapcou ---truncated---

HighCVSS 7.8 · v3.1—No exploit Fix available

Memory safety

Published: Sep 18, 2025
Updated: Aug 5, 2026
EPSS: 0.1% · 5th percentile
CWE: CWE-416

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 31 / 40 · 7.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.1%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 7.8
CNA · Linux: 7.8; agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

linux linux kernelbefore 4.14.296
linux linux kernel4.15 and later · before 4.19.262
linux linux kernel4.20 and later · before 5.4.220
linux linux kernel5.5 and later · before 5.10.150
linux linux kernel5.11 and later · before 5.15.75
linux linux kernel5.16 and later · before 5.19.17
linux linux kernel6.0 and later · before 6.0.3

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

Linux Linux
- 3.9affected
- b1a2a41126fc582a3d5613aa2d3e632b2eb1a2c4 and later · before 1613a7b24f1a7467cb727ba3ec77c9a808383560affected · git
- b1a2a41126fc582a3d5613aa2d3e632b2eb1a2c4 and later · before d79f4d903e14dde822c60b5fd3bedc5a289d25dfaffected · git
- b1a2a41126fc582a3d5613aa2d3e632b2eb1a2c4 and later · before 49c742afd60f552fce7799287080db02bffe1db2affected · git
- b1a2a41126fc582a3d5613aa2d3e632b2eb1a2c4 and later · before e01d96494a9de0f48b1167f0494f6d929fa773edaffected · git
- b1a2a41126fc582a3d5613aa2d3e632b2eb1a2c4 and later · before 232d59eca07f6ea27307022a33d226aff373bd02affected · git
- b1a2a41126fc582a3d5613aa2d3e632b2eb1a2c4 and later · before 27574a3f421c3a1694d0207f37c6bbf23d66978eaffected · git
- b1a2a41126fc582a3d5613aa2d3e632b2eb1a2c4 and later · before c369836cff98d3877f98c98e15c0151462812d96affected · git
- b1a2a41126fc582a3d5613aa2d3e632b2eb1a2c4 and later · before 3f42faf6db431e04bf942d2ebe3ae88975723478affected · git
- before 3.9not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Debian:12	linux	before 6.0.3-1	6.0.3-1
Red Hat:rhel_aus:8.2::baseos	bpftool	before 0:4.18.0-193.178.1.el8_2	0:4.18.0-193.178.1.el8_2
Red Hat:rhel_aus:8.2::baseos	bpftool-debuginfo	before 0:4.18.0-193.178.1.el8_2	0:4.18.0-193.178.1.el8_2
Red Hat:rhel_aus:8.2::baseos	kernel	before 0:4.18.0-193.178.1.el8_2	0:4.18.0-193.178.1.el8_2
Red Hat:rhel_aus:8.2::baseos	kernel-abi-whitelists	before 0:4.18.0-193.178.1.el8_2	0:4.18.0-193.178.1.el8_2
Red Hat:rhel_aus:8.2::baseos	kernel-core	before 0:4.18.0-193.178.1.el8_2	0:4.18.0-193.178.1.el8_2
Red Hat:rhel_aus:8.2::baseos	kernel-debug	before 0:4.18.0-193.178.1.el8_2	0:4.18.0-193.178.1.el8_2
Red Hat:rhel_aus:8.2::baseos	kernel-debug-core	before 0:4.18.0-193.178.1.el8_2	0:4.18.0-193.178.1.el8_2
Red Hat:rhel_aus:8.2::baseos	kernel-debug-debuginfo	before 0:4.18.0-193.178.1.el8_2	0:4.18.0-193.178.1.el8_2
Red Hat:rhel_aus:8.2::baseos	kernel-debug-devel	before 0:4.18.0-193.178.1.el8_2	0:4.18.0-193.178.1.el8_2
Red Hat:rhel_aus:8.2::baseos	kernel-debug-modules	before 0:4.18.0-193.178.1.el8_2	0:4.18.0-193.178.1.el8_2
Red Hat:rhel_aus:8.2::baseos	kernel-debug-modules-extra	before 0:4.18.0-193.178.1.el8_2	0:4.18.0-193.178.1.el8_2
Red Hat:rhel_aus:8.2::baseos	kernel-debuginfo	before 0:4.18.0-193.178.1.el8_2	0:4.18.0-193.178.1.el8_2
Red Hat:rhel_aus:8.2::baseos	kernel-debuginfo-common-x86_64	before 0:4.18.0-193.178.1.el8_2	0:4.18.0-193.178.1.el8_2
Red Hat:rhel_aus:8.2::baseos	kernel-devel	before 0:4.18.0-193.178.1.el8_2	0:4.18.0-193.178.1.el8_2
Red Hat:rhel_aus:8.2::baseos	kernel-doc	before 0:4.18.0-193.178.1.el8_2	0:4.18.0-193.178.1.el8_2
Red Hat:rhel_aus:8.2::baseos	kernel-modules	before 0:4.18.0-193.178.1.el8_2	0:4.18.0-193.178.1.el8_2
Red Hat:rhel_aus:8.2::baseos	kernel-modules-extra	before 0:4.18.0-193.178.1.el8_2	0:4.18.0-193.178.1.el8_2
Red Hat:rhel_aus:8.2::baseos	kernel-tools	before 0:4.18.0-193.178.1.el8_2	0:4.18.0-193.178.1.el8_2
Red Hat:rhel_aus:8.2::baseos	kernel-tools-debuginfo	before 0:4.18.0-193.178.1.el8_2	0:4.18.0-193.178.1.el8_2
Red Hat:rhel_aus:8.2::baseos	kernel-tools-libs	before 0:4.18.0-193.178.1.el8_2	0:4.18.0-193.178.1.el8_2
Red Hat:rhel_aus:8.2::baseos	perf	before 0:4.18.0-193.178.1.el8_2	0:4.18.0-193.178.1.el8_2
Red Hat:rhel_aus:8.2::baseos	perf-debuginfo	before 0:4.18.0-193.178.1.el8_2	0:4.18.0-193.178.1.el8_2
Red Hat:rhel_aus:8.2::baseos	python3-perf	before 0:4.18.0-193.178.1.el8_2	0:4.18.0-193.178.1.el8_2

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
90Now
CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
89Now
CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
85Now

Published before and after this one in the same product

← EarlierCVE-2022-50405Sep 18, 2025 · net/tunnel: wait until all sk_user_data reader finish before releasing the sock
22Monitor
← EarlierCVE-2022-50407Sep 18, 2025 · crypto: hisilicon/qm - increase the memory of local variables
22Monitor
Later →CVE-2022-50409Sep 18, 2025 · net: If sock is dead don't access sock's sk_wq in sk_stream_wait_memory
22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
Linux Linux	1613a7b24f1a7467cb727ba3ec77c9a808383560	Vendor (CNA)
Linux Linux	232d59eca07f6ea27307022a33d226aff373bd02	Vendor (CNA)
Linux Linux	27574a3f421c3a1694d0207f37c6bbf23d66978e	Vendor (CNA)
Linux Linux	3f42faf6db431e04bf942d2ebe3ae88975723478	Vendor (CNA)
Linux Linux	49c742afd60f552fce7799287080db02bffe1db2	Vendor (CNA)
Linux Linux	c369836cff98d3877f98c98e15c0151462812d96	Vendor (CNA)
Linux Linux	d79f4d903e14dde822c60b5fd3bedc5a289d25df	Vendor (CNA)
Linux Linux	e01d96494a9de0f48b1167f0494f6d929fa773ed	Vendor (CNA)
debian:linux	6.0.3-1 · Debian:12	Package registry (OSV)
red hat:bpftool	0:4.18.0-372.168.1.el8_6 · Red Hat:rhel_aus:8.6::baseos	Package registry (OSV)
red hat:bpftool-debuginfo	0:4.18.0-372.168.1.el8_6 · Red Hat:rhel_aus:8.6::baseos	Package registry (OSV)
red hat:kernel	0:4.18.0-372.168.1.el8_6 · Red Hat:rhel_aus:8.6::baseos	Package registry (OSV)
red hat:kernel-abi-stablelists	0:4.18.0-372.168.1.el8_6 · Red Hat:rhel_aus:8.6::baseos	Package registry (OSV)
red hat:kernel-core	0:4.18.0-372.168.1.el8_6 · Red Hat:rhel_aus:8.6::baseos	Package registry (OSV)
red hat:kernel-debug	0:4.18.0-372.168.1.el8_6 · Red Hat:rhel_aus:8.6::baseos	Package registry (OSV)
red hat:kernel-debug-core	0:4.18.0-372.168.1.el8_6 · Red Hat:rhel_aus:8.6::baseos	Package registry (OSV)
red hat:kernel-debug-debuginfo	0:4.18.0-372.168.1.el8_6 · Red Hat:rhel_aus:8.6::baseos	Package registry (OSV)
red hat:kernel-debug-devel	0:4.18.0-372.168.1.el8_6 · Red Hat:rhel_aus:8.6::baseos	Package registry (OSV)
red hat:kernel-debug-modules	0:4.18.0-372.168.1.el8_6 · Red Hat:rhel_aus:8.6::baseos	Package registry (OSV)
red hat:kernel-debug-modules-extra	0:4.18.0-372.168.1.el8_6 · Red Hat:rhel_aus:8.6::baseos	Package registry (OSV)
red hat:kernel-debuginfo	0:4.18.0-372.168.1.el8_6 · Red Hat:rhel_aus:8.6::baseos	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Someone with local access to the system can trigger it.
A low-privileged account is enough.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Local
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1free(dev->buf);
2/* ... another thread is still running ... */
3process(dev->buf);

Fixed

1lock(&dev->lock);
2free(dev->buf);
3dev->buf = NULL;
4unlock(&dev->lock);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

Fix✗ → ✓Sep 28, 2026, 10:11 PM UTC

For records you follow, these changes also arrive as notifications. →

References

git.kernel.org/stable/c/1613a7b24f1a7467cb727ba3ec77c9a808383560

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records